INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
U1
MSZ-JP09WA
MSZ-JP12WA
-
U1
-
No. OBH820
MSZ-JP09WA
Outdoor unit service manual
MUZ-JP•WA Series (OBH821)
CONTENTS
1. TECHNICAL CHANGES
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS ································9
8. MICROPROCESSOR CONTROL ················ 11
9. TROUBLESHOOTING ·······························15
10. DISASSEMBLY INSTRUCTIONS ·················27
PARTS CATALOG (OBB820)
· ·······························
2
Use the specifi ed refrigerant only
OBH820
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
1
TECHNICAL CHANGES
MSZ-JP09WA
MSZ-JP12WA
1. New model
U1
-
U1
-
2
2
OBH820
PART NAMES AND FUNCTIONS
MSZ-JP09WA MSZ-JP12WA
Air ¿ lter
Air cleaning ¿ lter
(Anti-Allergy Enzyme
Filter, option)
Air inlet
Air outlet
Horizontal vane
Display section
Front panel
Heat exchanger
Remote controller
Remote control receiving section
ACCESSORIES
Installation plate 1
Attachment screws for the installation plate
4 × 25 mm
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Remote controller holder 1
Screws for the remote controller holder
3.5 × 16 mm (Black)
Operation indicator lamp
Emergency operation switch
5
2
3
3
OBH820
Indoor model MSZ-JP09WA MSZ-JP12WA
Power supply V, phase, Hz 115, 1, 60
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity A 1.4
Fan motor F.L.A 1.07
Airfl ow
Super High - High - Med. Low
Moisture removal pt./h 1.5 2.5
Sound level
Super High - High - Med. Low
Fan speed
Super High - High - Med. Low
Cond. drain connection O.D. in. 5/8
Dimensions
Weight Ib. 22
External fi nish Munsell 1.0Y 9.2/0.2
Control voltage (by built-in transformer) 12 - 24 V DC
NOTE: Test conditions are based on AHRI 210/240.
SPECIFICATION
COOL Dry
(Wet)
HEAT Dry CFM 406 - 321 - 237 - 170
Cooling dB(A) 43 - 37 - 30 - 22 45 - 37 - 30 - 22
Heating dB(A) 43 - 37 - 30 - 22
Cooling rpm 1,020 - 860 - 670 - 530
Heating rpm 1,040 - 860 - 670 - 530
W
D 9-1/8
H 11-5/8
A15 20
CFM
in.
399 - 321 - 237 - 170
(364 - 286 - 201 - 134)
31-7/16
4
3-1. OPERATING RANGE
OBH820
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Indoor unit
115 V
1 phase
60 Hz
(2) OPERATION
Mode Condition
Standard temperature 80 67 95 —
Cooling
Heating
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 -4 -5
3-2. OUTLET AIR SPEED AND COVERAGE
Model Mode Function
HEAT Dry 406 20.6 29.5
MSZ-JP09WA
MSZ-JP12WA
COOL
HEAT Dry 406 20.6 29.5
COOL
Dry 399 20.2 29.0
Wet 364 18.4 26.5
Dry 399 20.2 29.0
Wet 364 18.4 26.5
Airfl ow
(CFM)
Min. 103
Indoor Outdoor
DB WB DB WB
Air speed
(ft./s.)
115
Max. 127
Intake air temperature (°F)
Coverage
(ft.)
● The air coverage is the figure up to the
position where the air speed is 1 ft./s.,
when air is blown out horizontally from
the unit properly at the High speed position.
The coverage should be used only as a
general guideline since it varies according to the size of the room and furniture
arranged inside the room.
5
4
OBH820
OUTLINES AND DIMENSIONS
MSZ-JP09WA MSZ-JP12WA
2-1/4
5-1/2
11/16
Unit: inch
Insulation ø1 - 3/8 O.D
Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)
Gas line ø3/8 16 - 15/16
Piping
Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D
(Flared connection: ø3/8)
6
5
OBH820
MSZ-JP09WA MSZ-JP12WA
WIRING DIAGRAM
7
6
OBH820
REFRIGERANT SYSTEM DIAGRAM
MSZ-JP09WA MSZ-JP12WA
Refrigerant pipe ø3/8 (ø9.52)
(with heat insulator)
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Flared connection
Flared connection
Unit: inch (mm)
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
8
7
OBH820
SERVICE FUNCTIONS
MSZ-JP09WA MSZ-JP12WA
7-1. TIMER SHORT MODE
For service, the set time can be shortened by bridging of the timer short point on the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
• The set time for the ON/OFF timer can be reduced to 1 second for each minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to
3 seconds. Restarting the compressor, which takes 3 minutes, cannot be reduced.
7-2. REMOTE CONTROLLER P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, the remote controller P.C. boards must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below:
J2
J1
NOTE: For modification, take out the
batteries and press the STOP/
OPERATE (OFF/ON) button 2
or 3 times at first.
After finish modification, put
back the batteries then press
the RESET button.
The remote controller P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as
shown in Table 1.
After modification, press the RESET button.
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modifi cation Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
9
7-3. AUTO RESTART FUNCTION
OBH820
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in
the same mode just before the shut-off of the main power.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to disable “AUTO RESTART FUNCTION”
Turn OFF the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)
JR07
Indoor electronic
control P.C. board
CN111CN112
CN151
CN10A
NOTE:
•
The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the
remote controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is
cancelled.
• If the unit has been turned OFF with the remote controller before power failure, the auto restart function does not
work as the power button of the remote controller is OFF.
• To prevent the breaker from tripping OFF due to the rush of starting current, systematize other home appliance not to
turn ON at the same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting
current by adding to the system that allows the units to start one by one.
10
8
OBH820
MICROPROCESSOR CONTROL
MSZ-JP09WA MSZ-JP12WA
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
OFF/ON (stop/operate) button
Fan speed control button
Operation select button
Timer mode select button
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
Temperature buttons
ECONO COOL button
Vane control button
Time set buttons
RESET button
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
Indication Operation state Room temperature
The unit is operating to
reach the set temperature
About 4°F (2°C) or more
away from set temperature
Lit
Blinking
Not lit
The room temperature is
approaching the set temperature
About 2 to 4 °F (1° to 2°C)
from set temperature
8-1. COOL ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 61 - 88°F (16 - 31°C).
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil
from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works. The indoor fan
operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger
rises.
11
8-2. DRY ( ) OPERATION
OBH820
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention works the same way as that in COOL mode. (8-1.1.)
8-3. HEAT ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 61 - 88°F (16 - 31°C).
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor
heat exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
8-4. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
AUTO 1 2 3 4 5 SWING
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected
angle.
Confirmation of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(c) When standby mode (only during multi system operation) starts or finishes.
12
Horizontal
position
5
(4) VANE AUTO ( ) mode
OBH820
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
In COOL and DRY operation
Vane angle is fixed to Horizontal position.
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When STOP/OPERATE (OFF/ON) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time
exceeds 0.5 - 1 hour, the vane angle automatically changes to Angle 2 for dew prevention.
(7) SWING (
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
(8) Cold air prevention in HEAT operation.
The horizontal vane position is set to Upward.
(9) ECONO COOL (
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 4°F (2°C) higher.
Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air
conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is
pressed or change to other operation mode.
) mode
) operation (ECONOmical operation)
In HEAT operation
Vane angle is fixed to Angle 5.
In HEAT operation
Vane angle is fixed to Angle 4.
8-5. TIMER OPERATION (ON/OFF TIMER)
1. How to set the timer
(1) Press STOP/OPERATE (OFF/ON) button to start the air conditioner.
(2) Select the timer mode by pressing the
Each time this button is pressed, the timer mode is changed in sequence:
(3) Set the time of the timer using the
Each time this button is pressed, the set time increase or decrease by 1 hour to 12 hours.
2. To release the timer
Press the
NOTE:
• The OFF TIMER and the ON TIMER cannot be set at the same time.
• The displayed time is the time remaining and will decrease in 1-hour increments as time passes.
(OFF TIMER) → (ON TIMER) → TIMER RELEASE
button until
(OFF TIMER) and (ON TIMER) are not displayed.
button during operation.
button.
13
EMERGENCY OPERATION switch
8-6. EMERGENCY/TEST OPERATION
OBH820
In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the
indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in
the remote controller are running down. The unit will start and OPERATION INDICATOR lamp will light up.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High
speed and the temperature control does not work.
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of
75°F (24°C). The fan speed shifts to Med.
The coil frost prevention works even in the test run or the emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.
Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any
signal from the remote controller. In the latter case, normal operation will start.
NOTE: Do not press EMERGENCY OPERATION switch during normal operation.
Operation mode COOL HEAT
Set temperature 75°F (24°C) 75°F (24°C)
Fan speed Med. Med.
Horizontal vane Auto Auto
The operation mode is indicated by the
Operation Indicator lamp as follows:
Operation Indicator lamp
EMERGENCY COOL
↓
EMERGENCY HEAT
↓
STOP
Lit
Not lit
8-7. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
8-8. Changing temperature indication (°F/°C)
• The preset unit is °F.
• °F → °C: Press RESET button while the TEMPERATURE buttons are pressed.
• °C → °F: Press RESET button while the TEMPERATURE buttons are pressed.
Press RESET button gently
using a thin instrument.
14
Lead wiring
Connector housing
<Incorrect>
<Correct>
9
OBH820
TROUBLESHOOTING
MSZ-JP09WA MSZ-JP12WA
9-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.
3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is blinking ON and OFF to indicate an abnormality.
To make sure, check how many times the OPERATION INDICATOR lamp is blinking ON and OFF before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for
bursting and discoloration.
4) When troubleshooting, refer to 9-2, 9-3 and 9-4.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
Remove the back lid and insert batteries.
Then reattach the back lid.
Press RESET button with a thin instrument, and
then use the remote controller.
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the
battery replacement.
3. Do not use the leaking batteries.
15
9-2. FAILURE MODE RECALL FUNCTION
OBH820
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can
be recalled.
1. Flow chart of failure mode recall function
for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
Hold down the other 2 buttons for another 3 seconds. Make sure that the indicators on
the LCD screen shown in the right fi gure is all displayed.
Then release the buttons.
Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is
displayed) with the remote controller headed towards the indoor unit.
Does upper lamp of OPERATION INDICATOR
lamp on the indoor unit blink at the interval of 0.5
seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep is emitted at the same timing as the
blinking of upper lamp of OPERATION
INDICATOR lamp. 2
Judgment of indoor/outdoor abnormality
Releasing the failure mode recall function
Deleting the memorized abnormal condition
NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
ON
OFF
3.Blinking pattern when the outdoor unit is abnormal:
ON
OFF
Before blinking, does upper lamp of
OPERATION INDICATOR lamp stay ON for 3
seconds?
When it stays ON for 3 seconds (without beep):
The indoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point by referring to the
indoor unit failure mode table. (Refer to 9-2.2)
Make sure to check at least 2 consecutive blinking cycles.
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
2.5-second OFF
2.5-second OFF 3-second ON
The outdoor unit is abnormal.
Blinking at 0.5second interval
Repeated cycle Repeated cycle
Yes
(Blinks)
No
Repair the failure parts.
2.5-second OFF
Beeps
No beep Beeps
Repeated cycle
Blinking at 0.5second interval
Yes
2
1
No
(OFF)
Blinking at 0.5second interval
Beeps
2.5-second OFF 3-second ON
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that cannot be recalled with this way.
Check if outdoor unit is abnormal according to the detailed outdoor unit
failure mode recall function.
1 Regardless of normal or abnormal condition,
a short beep is emitted once the signal is received.
The outdoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point by referring
to the outdoor unit failure mode table. (Refer to outdoor unit service
manual.)
Make sure to check at least 2 consecutive blinking cycles.
Beeps
Repeated cycle
No beep Beeps
Repeated cycle
Blinking at 0.5second interval
3
Repeated cycle
16
2. Table of indoor unit failure recall function
OBH820
Upper lamp of OPERATION INDICA-
TOR lamp
Not lit Normal — —
1-time blink every
0.5-second
2-time blink
2.5-second OFF
3-time blink
2.5-second OFF
11-time blink
2.5-second OFF
12-time blink
2.5-second OFF
Abnormal point
(Failure mode)
Room temperature
thermistor
Indoor coil
thermistor
Serial signal
Indoor fan motor
Indoor control
system
Condition Remedy
The room temperature thermistor short or
open circuit is detected every 8 seconds during operation.
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
The serial signal from outdoor unit is not received for a maximum of 6 minutes.
The rotational frequency feedback signal is
not emitted for 12 seconds after the indoor fan
motor is operated.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Refer to the characteristics of the room temperature
thermistor (9-7.).
Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (9-7.).
Refer to 9-6.
signal error".
Refer to 9-6.
Replace the indoor electronic control P.C. board.
"How to check miswiring and serial
"Check of indoor fan motor".
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (9-4.).
17
9-3. INSTRUCTION OF TROUBLESHOOTING
OBH820
Start
Indoor unit operates.
Outdoor unit
does not operate.
Outdoor unit
operates only
in Test Run
operation.
Check room
temperature
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Outdoor unit
does not
operate even
in Test Run
operation.
Refer to "How
to check
inverter/compressor".
Indoor unit operates.
Outdoor unit does
not operate normally.
Unit does not
operate normal operation
in COOL or
HEAT mode.
Refer to
"Check of R.V.
coil".
Indoor unit does
not receive the
signal from remote controller.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Refer to 9-6.
"Check of remote
controller and
indoor electronic control P.C.
board".
OPERATION INDICATOR
lamp on the indoor unit is
blinking ON and OFF.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor/outdoor connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 9-6. "Check
of indoor P.C. board
and indoor fan motor".
"Test Run operation" means the
operation within 30 minutes after EMERGENCY OPERATION
switch is pressed.
If blinking of OPERATION INDICATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Refer to outdoor unit service manual.
Upper lamp
Flash ON
and OFF at
0.5-second
intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of serial signal.
Refer to
9-6. "How
to check miswiring and
serial signal
error".
Upper lamp
2-time blink
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor.
Check room
temperature
thermistor
and indoor
coil thermistor. Refer
to 9-7."Test
point diagram
and voltage".
Upper lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor.
Refer to
9-6. "Check
of indoor fan
motor".
Upper lamp
4-time blink
Cause:
Indoor unit
• Trouble
of indoor
unit control
system.
Replace the
indoor electronic control
P.C. board.
Upper lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power system abnormality.
Refer to
"How to
check
inverter/compressor".
18
Upper lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit.
Refer to
"Check of
outdoor thermistors".
Upper lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor control system.
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Upper lamp
14-time blink
or more
Cause:
Outdoor unit
• Other abnormality
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall function."
9-4. TROUBLESHOOTING CHECK TABLE
OBH820
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks.
OPERATION INDICATOR
Lit
Blinking
Not lit
Abnormal
No.
1
point
Miswiring
or serial
signal
Upper lamp blinks.
0.5-second ON
0.5-second OFF
Operation indicator lamp Symptom Condition Remedy
Refer to 9-6.
The serial signal from the outdoor unit is not
received for 6 minutes.
•
miswiring and serial signal error".
"How to check
Indoor coil
thermistor
2
Room temperature
thermistor
Indoor fan
3
motor
Indoor con-
4
trol system
Outdoor
5
power system
Outdoor
6
thermistors
Outdoor
7
control system
Other ab-
8
normality
Upper lamp blinks.
2-time blink
2.5-second OFF
Upper lamp blinks.
3-time blink
2.5-second OFF
Upper lamp blinks.
4-time blink
2.5-second OFF
Upper lamp blinks.
5-time blink
2.5-second OFF
Upper lamp blinks.
6-time blink
2.5-second OFF
Upper lamp blinks.
7-time blink
2.5-second OFF
Upper lamp blinks.
14-time blink or more
2.5-second OFF
Indoor unit and
outdoor unit do
not operate.
The indoor coil or the room temperature thermistor is short or open circuit.
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
It consecutively occurs 3 times that the compressor stops for overcurrent protection or
start-up failure protection within 1 minute after
start-up.
The outdoor thermistors short or open circuit
during the compressor operation.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
An abnormality other than above mentioned
is detected.
Refer to the characteristics of
•
indoor coil thermistor, and the
room temperature thermistor
(9-7.).
Refer to 9-6.
•
door fan motor".
Replace the indoor electronic
•
control P.C. board.
Refer to "How to check of in-
•
verter/compressor".
Refer to outdoor unit service
manual
Check the stop valve.
•
Refer to "Check of outdoor
•
thermistor".
Refer to outdoor unit service
manual.
Replace the inverter P.C. board
•
or the outdoor electronic control
P.C. board.
Refer to outdoor unit service
manual.
Check the stop valve.
•
Check the 4-way valve.
•
Check the abnormality in detail
•
using the failure mode recall
function for outdoor unit.
"Check of in-
Outdoor
9
control system
Upper lamp lights up.
Outdoor unit
does not operate
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
19
Check the blinking pattern of
•
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
9-5. TROUBLE CRITERION OF MAIN PARTS
OBH820
MSZ-JP09WA MSZ-JP12WA
Part name Check method and criterion Figure
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF) Check 9-6.
Measure the resistance with a tester.
Refer to 9-7. "Test point diagram and voltage", 1 or 2. "Indoor electronic
control P.C. board", for the chart of thermistor.
Horizontal vane motor (MV)
Measure the resistance between the terminals with a tester.
(Part temperature 50 - 86°F (10 - 30°C))
Color of the lead wire Normal
RED-BLK 223 - 268 Ω
BLK
BLK
RED
ROTOR
ROTOR
BLK
BLK
20
9-6. TROUBLESHOOTING FLOW
OBH820
A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan does not operate.
Turn OFF the power supply.
Is there any foreign matter that interferes
the rotation of the line fl ow fan?
Yes
Remove the foreign matter and
adjust the line fl ow fan.
Is there 162 V DC
between CN211
and (–) ?
Replace the indoor power P.C.
board [and the indoor terminal P.C.
board].
(+)
No
Yes
No
Yes
Pay enough attention to the high voltage on the fan motor connector.
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed.
If more than 12 seconds passes, turn OFF the power supply and turn it
ON again, then measure the voltage.
<Indoor power P.C. board>
1. Measure the voltage between CN211
2. Measure the voltage between CN211
<Indoor electronic control P.C. board>
3. Measure the voltage between CN10A
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage measured at 2. above goes 0 V DC although the
indoor P.C. board is normal.
Does the voltage between CN211
(+) and
rise to the range of 3 to 6 V DC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
(–) on the power P.C. board
No
Does the voltage between CN10A
(+) and JPG (GND)(–) on the
indoor electronic control P.C. board
fall to 2 V or less within 12 seconds
after EMERGENCY OPERATION
switch is pressed?
(+) and (–).
(+) and (–).
(+) and JPG(GND)(–).
Yes
No
Replace the indoor fan motor.
Replace the indoor electronic
control P.C. board.
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
Measure the voltage between CN211
(+) and (–) while the fan motor is
rotating.
Replace the indoor power P.C. board
[and the indoor terminal P.C. board].
Yes
(Unchanged)
Is it unchanged holding 0
or 15 V DC?
Yes
(Unchanged)
Replace the indoor fan motor.
Is it unchanged holding
0 or 5 V DC?
No
(Changed)
No
(Changed)
Measure the voltage CN10A (+) and JPG
(GND)(–) on the indoor electronic control P.C.
board when the fan motor is rotating.
Replace the indoor electronic control
P.C. board.
21
B Check of remote controller and indoor electronic control P.C. board
OBH820
Check if the remote controller is exclusive for this air conditioner.
Press STOP/OPERATE (OFF/ON)
button on the remote controller.
Is LCD display on the remote controller
visible?
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Yes
No
(Not clear)
No
Replace the batteries. (Refer to 9-1.4.)
Turn ON a radio to AM and press STOP/
OPERATE (OFF/ON) button on the remote
controller.
1
1 Look at the image of the signal transmitting section of
the remote controller through the monitor of a digital
camera or a camera phone. It is normal if the LED of
the signal transmitting section lights up when the STOP/
OPERATE (OFF/ON) button on the remote controller is pressed. However, it may be diffi cult to see the
illuminated LED of the signal transmitting section with a
smartphone camera.
2 If the inverter fl uorescent light is turned on when the
room is cool, the unit may have diffi culty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter fl uorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
OK
Is noise heard from radio?
Yes
Are there any fl uorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.(1m)?
Replace the indoor electronic control
P.C. board. (Including the receiver)
No
2
No
Yes
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a fi lter on receiving part.
22
C Check of indoor P.C. board and indoor fan motor
OBH820
Turn OFF the power supply.
Remove indoor fan motor connector CN211
from indoor power P.C. board and vane
motor connector CN151 from the indoor
electronic control P.C. board and turn ON
the power supply.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
No
Measure the resistance of indoor fan
motor.
(Refer to 9-6
Measure the resistance of the vane
motor coil.
Yes
(Refer to 9-5.)
Replace the varistor (NR11)
and fuse (F11).
.)
3
Short/ open circuit:
Replace the indoor fan motor.
Short/ open circuit:
Replace the vane motor and the indoor
electronic control P.C. board.
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor power P.C. board
visually.
1. The fan motor connector's lead wire is red,
whereas
2. Connect "+" of the tester to fan motor
connector's
otherwise the resistance cannot be measured
properly.
3. Please replace the fuse after removing the
indoor power P.C. board from the electrical
box.
MSZ-JP09/12NA
is black.
lead wire, and “-” to lead wire,
Measure the resistance of resistor (R111)
on the indoor power P.C. board.
Indoor electronic control
P.C. board
Indoor terminal
Fuse
(F11)
P.C. board
Indoor power P.C. board
Varistor
(NR11)
Is the varistor (NR11)
burnt and the fuse (F11)
blown?
Be sure to check both the fuse and
the varistor in any case.
Is the fuse (F11) blown
only?
Measure the resistance between
(+) and (-) of indoor fan
CN211
motor connector.
Is the resistance 1MΩ or more?
Replace the fuse (F11).
JPN (GND)
CN10A
12 VDC
5 VDC
R111
CN211
Yes
Yes
1, 2
Yes
Is there resistance of resistor
(R111) approximately 2 Ω?
Is there approximately 5 V DC between
5 V (+) and GND (-) of the indoor
electronic control P.C. board? Is there
approximately 9 V to 13 V DC between
12 V (+) and GND (-) of the indoor
electronic control P.C. board?
Is the connector CN10A on
the indoor electronic control
P.C. board or lead wires
disconnected?
Replace the indoor electronic control P.C. board.
No
No
Replace the fuse (F11) and the
No
3
indoor fan motor.
Yes
No
Yes
No
No
3
Replace the indoor power
P.C. board and the indoor
fan motor and the indoor
terminal P.C. board.
Replace the indoor fan motor.
Yes
Connect the connector CN10A or repair
disconnection.
23
D How to check miswiring and serial signal error
OBH820
Turn OFF the power supply.
Is there rated voltage in the power supply?
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light
up? <Confi rmation of the power to the indoor
unit>
Is serial signal error indicated 6 minutes later?
Turn OFF the power supply.
Check once more if the indoor/outdoor
B
connecting wire is not miswiring.
Bridge the outdoor terminal block S2 and
1
S3.
Turn ON the power supply.
Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal? (Refer
to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.)
Yes
Yes
Yes
Yes
A
Yes
No
No
No
1. Miswiring may damage indoor electronic control P.C.
3. Be sure to check this within 3 minutes after turning ON.
(Except for outdoor unit of multi system type)
Check the power supply.
No
Is there any miswiring, poor
contact, or wire disconnection of the indoor/outdoor
connecting wire?
No
board during the operation.
Be sure to confi rm the wiring is correct before the opera-
tion starts.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
Check the wiring.
Correct them.
Yes
Check of power supply.
(Refer to the outdoor
No
service manual.)
Does the LED on the inverter P.C. board or the outdoor electronic control P.C.
board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"?
Turn OFF the power supply.
Remove the bridge between outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there rated voltage between indoor terminal block S1 and S2?
<Confi rmation of power voltage>
Is there amplitude of 10 to 20 V DC between indoor terminal block S2
and S3? <Confi rmation of serial signal>
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
• Reinstall
either the unit
or the light
away from
Is serial signal
error indicated 6
minutes later?
Yes
B
each other.
• Attach a fi lter
No
on remote
control receiving section
of the indoor
unit.
3
Yes
No
Yes
No
Yes
Is there 2 V DC or less between CN10A (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
Yes
Is there 2 V DC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
Replace the indoor power
P.C. board and the indoor
terminal P.C. board
No
No Yes No
Replace the indoor electronic control P.C. board.
Replace the inverter P.C. board or the outdoor
No
(Lit or not
lighted)
Check the wiring
If there are any error of the indoor/outdoor connecting wire:
such as the damage of the wire, intermediate connection,
and/or poor contact to the terminal block, replace the indoor/
outdoor connecting wire.
electronic control P.C. board. 2
2. Be careful of the residual voltage of smoothing
capacitor.
Is there 2 V DC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
Yes
24
E Electromagnetic noise enters into TV sets or radios
OBH820
Is the unit grounded?
Yes
Is the distance between the antennas
and the indoor unit within 9.91 ft.(3 m),
or is the distance between the antennas
and the outdoor unit within 9.91 ft.(3 m)?
No
Is the distance between the TV sets or radios
and the indoor unit within 3.28 ft.(1 m), or is
the distance between the TV sets or radios
and the outdoor unit within 9.91 ft.(3 m)?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
No
No
Yes
Yes
Yes
Yes
Ground the unit.
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Extend the distance between the TV sets and/
or radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Replace or repair the antenna.
Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength
or the installation condition (combination of specifi c conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiv-
er
5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifi er such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press STOP/OPERATE (OFF/ON) button on the remote controller
for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the
electromagnetic noise.
4) Press STOP/OPERATE (OFF/ON) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
25
9-7. Test point diagram and voltage
OBH820
MSZ-JP09WA MSZ-JP12WA
1. Indoor power P.C. board, Indoor terminal P.C. board
Indoor terminal P.C. board Indoor power P.C. board
Fuse (F11)( )
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
Please replace the fuse after removing the indoor terminal P.C.
board from the electrical box.
Varistor (NR11)
5 V DC
2. Indoor electronic control P.C. board
Resistor (R111)
GND
Indoor fan motor
(CN211)
(+)0-6 V
(+)3-6 V DC
15 V DC
(–) GND (high-
voltage DC)
162 V DC
12 V DC
Timer short mode point JPG JPS
(Refer to 7-1.)
Emergency operation
switch (SW1)
Room temperature thermistor
RT 11 ( CN111)
Indoor coil thermistor RT12,
RT13 (CN112)
GND
Vane motor
(CN151)
Connector to
Indoor power P.C.
board (CN10A)
5 V DC
To disable "Auto restart function",
solder the Jumper wire to JR07.
(Refer to 7-3.)
12 V DC
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Resistance (kΩ)
32
50 68 86 104 122 140
Temperature (°F)
26
10
OBH820
DISASSEMBLY INSTRUCTIONS
<Detaching method of the terminal with locking mechanism>
The terminal which has the locking mechanism can be detached as shown below.
There are 2 types of terminals with locking mechanisms.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector shown below
Sleeve
has the locking mechanism.
Slide the sleeve.
Pull the terminal while
Locking lever
pushing the locking
lever.
10-1. MSZ-JP09WA MSZ-JP12WA
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE PHOTOS/FIGURES
1. Removing the panel
(1) Remove the horizontal vanes.
(2) Remove the screw caps of the panel. Remove the
screws of the panel.
(3) Unhook the lower part (
(4) Hold the lower part of both ends of the panel and pull
it
slightly toward you, and then remove the panel by
pushing
it upward.
) of the panel.
Photo 1
Horizontal vanes
Hold the sleeve, and
pull out the terminal
slowly.
Connector
: Indicates the visible parts in the photos/fi gures.
: Indicates the invisible parts in the photos/fi gures.
Front panel
27
A
Screws of the panel
OPERATING PROCEDURE PHOTOS/FIGURES
OBH820
2. Removing the indoor electronic control P.C.
board and the room temperature thermistor
(1) Remove the panel (Refer to section 1.) and the corner
box.
(2) Remove the screw of the V.A. clamp and the V.A.
clamp.
(3) Loosen the screw of the indoor/outdoor connecting
wire and remove the indoor/outdoor connecting wire.
(4) Remove the screw of the electrical cover and the
electrical cover.
(5) Open the indoor electronic control P.C. board holder (to
right side)
(6) Disconnect the following connectors:
<Indoor electronic control P.C. board>
CN112 (Indoor coil thermistor)
CN151 (Vane motor)
CN10A (To the indoor power P.C. board)
(7) Unhook the catches of the indoor electronic control
P.C. board holder from the nozzle and the electrical
box (right side).
(8) Remove the indoor electronic control P.C. board hold-
er from the conduit cover.
(9) Remove the room temperature thermistor from the
hook of the indoor electronic control P.C. board holder.
(10)
Open the back side of the indoor electronic control P.C.
board holder, and remove the indoor electronic control P.C. board.
(11)
Remove the room temperature thermistor from the
indoor electronic control P.C. board.
3. Removing the indoor power P.C. board, the
indoor terminal P.C. board, and the electrical
box
(1) Remove the panel (Refer to section 1.) and the corner
box.
(2) Remove the indoor/outdoor connecting wire and the
indoor electric control P.C. board holder. (Refer to
section 2 (2)-(8).).
(3) Remove the screw of the conduit cover and the con-
duit cover.
(4) Remove the screw of the conduit plate and the con-
duit plate.
(5) Remove the ground wire connected to the indoor heat
exchanger from the electrical box.
(6) Remove the screw fixing the electrical box.
(7) Unhook first the lower, then the upper catches of the
electrical box, and pull out the electrical box.
(8) Disconnect all the connectors on the indoor power P.C.
board and unhook all lead wires.
(9) Remove the screw of terminal block on the indoor ter-
minal P.C. board.
(10)
Remove the indoor power P.C. board and the indoor
terminal P.C. board.
Photo 2
Catch of indoor electronic
control P.C. board holder
Photo 3
Terminal block
Ground wire
Indoor terminal
P.C. board
Catch of indoor electronic
control P.C. board holder
Photo 4
Electrical box
Screw of the
electrical cover
Screw of the
V.A. clamp
Indoor electronic
control
P.C. board holder
Upper catch
Indoor power
P.C. board
Lower catch
Screw of the
conduit plate
Screw of the
conduit cover
Screw of the
electrical box
28
OPERATING PROCEDURE PHOTOS/FIGURES
OBH820
4. Removing the nozzle assembly
(1) Remove the panel (Refer to section 1.) and the corner
box.
(2) Remove the indoor/outdoor connecting wire (Refer to
section 2 (2)-(7).).
(3) Remove the indoor electronic control P.C. board hold-
er.
(4) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
5. Removing the horizontal vane motor
(1) Remove the nozzle assembly. (Refer to section 4.)
(2) Remove the screws of the horizontal vane motor unit.
(3) Disconnect the connector from the horizontal vane
motor.
(4) Remove the screws of the horizontal vane motor.
(5) Remove the horizontal vane motor from the horizontal
vane motor unit.
Photo 5
Screws of horizontal vane motor unit
29
OPERATING PROCEDURE PHOTOS/FIGURES
OBH820
6. Removing the indoor fan motor, the indoor coil
thermistor, and the line flow fan
(1) Remove the panel (Refer to section 1.) and the corner
box.
(2) Remove the indoor electronic control P.C. board hold-
er, the electrical box and the nozzle assembly.
(3) Remove the screws fixing the motor bed.
(4) Loosen the screw fixing the line flow fan.
(5) Remove the motor bed together with fan motor and
motor band.
(6) Release the hooks of the motor band. Remove the
motor band. Pull out the indoor fan motor.
(8) Remove the indoor coil thermistor from the heat
exchanger.
) Install the indoor coil thermistor in its former position
(
when assembling it. (See photo 9)
(9) Remove the screws fixing the left side of the heat
exchanger.
(10)
Lift the heat exchanger, and pull out the line flow fan
to the lower-left.
When attaching the line flow fan, screw the line flow
fan so 5/32 inch (4 mm) gap is provided between the
right end of the line flow fan and the right wall of the
air passage of the box (Figure 1).
Figure 1
Photo 6
Screw of the line flow fan
Photo 7
Motor band
Screws of the
motor bed
5/32 inch
(4 mm)
Photo 9
Indoor coil
thermistor(sub)
RT13
Indoor coil
thermistor(main)
RT12
Photo 8
Screws of the
left side of the
heat exchanger
30
Fixing the indoor coil thermistor
OBH820
There are 2 forms of parts for fixing the indoor coil thermistor.
Holder shapeClip shape
Position and procedure for mounting the clip-shape part
1. Set the indoor coil
thermistor in the center of
the clip-shape part.
2. Check the (marked)
mounting position.
When fixing the indoor coil thermistor
to the clip-shape/holder-shape part, the
lead wire should point down.
About the
same length
3. Mount the
clip-shape part.
NOTE:
Take care to avoid loss and accidental falling of the clip-shape part inside the unit.
Mount the clip-shape part on the marked position.
Do not pull the lead wire when removing the indoor coil thermistor.
31
HEAD OFFICE: TOKYO BUILIDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2018 MITSUBISHI ELECTRIC CORPORATION
Published: Nov. 2018. No.OBH820
Made in Japan
Specifications are subject to change without notice.
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